| This control addresses ESXi standard switches. Distributed switches are addressed in the vCenter STIG. If there is no standard switch on the ESXi host, this is not applicable. |
From the vSphere Client, go to Hosts and Clusters.
Select the ESXi Host >> Configure >> Networking >> Virtual Switches.
On each standard switch, click the '...' button next to each port group and select "Edit Settings".
Click the "Security" tab. Verify that "MAC Address Changes" is set to "Reject" and that "Override" is not checked.
From a PowerCLI command prompt while connected to the ESXi host, run the following commands:
Get-VirtualSwitch | Get-SecurityPolicy
Get-VirtualPortGroup | Get-SecurityPolicy | Select-Object *
If the "MAC Address Changes" policy is set to "Accept" (or "true", via PowerCLI) or the security policy inherited from the virtual switch is overridden, this is a finding.